I loved the analysis of the soundtrack embedded as a YouTube video [1] about halfway through the article. The composer, Soyo Oka, only brought one song from the NES version into the SNES version. The author of the video walks you through each track and explains what channels were used, what can be learned about the waveforms, how it compares to other NES music of the period, etc.

[1] https://www.youtube.com/watch?time_continue=791&v=HmJP5EFUEp...